Author Topic: CB400 Four to XR400 Four (Read 51089 times)

Zaipai · « **Reply #75 on:** June 19, 2010, 06:38:33 PM »

Talk about getting lucky.. That is great.. Don't forget the video when she is running again!

.: Scott :.

Pezz · « **Reply #76 on:** July 01, 2010, 05:02:48 PM »

Okay

The rotor is coming out this weekend and being cleaned up in my lathe.

While the carbies are out I will sort the jetting. Its very hard to find larger jets for these carbies.

I am looking for some jet drills, but the question is:

Anyone have a good idea, also cost effective, regarding carbies to replace the stock ones?

Industrial Rat400f Killer · « **Reply #77 on:** July 01, 2010, 05:24:06 PM »

What size jet do you need?
You can buy CR carbs but you'll have to wait until they restock them.

Pezz · « **Reply #78 on:** July 01, 2010, 08:24:29 PM »

Currently runs 75's, need 80 & 85

Industrial Rat400f Killer · « **Reply #79 on:** July 02, 2010, 06:20:44 AM »

I think I have some 75's,80's and 90's that I don't need if you want them let me know, I'm running pod air filters with 85's and stock slow jets.

Pezz · « **Reply #80 on:** July 03, 2010, 03:06:53 PM »

Quote from: Rat400F on July 02, 2010, 06:20:44 AM

I think I have some 75's,80's and 90's that I don't need if you want them let me know, I'm running pod air filters with 85's and stock slow jets.

The 80's would be nice to try, thanks. Where did you buy yours from?

I was wondering if the 500/4 carbies would be much of a headache to fit?

This is a scrapheap bike after all

Industrial Rat400f Killer · « **Reply #81 on:** July 03, 2010, 06:43:06 PM »

I'm out of town, when I get home I'll post a link. I'm not sure if the 500/4 carbs would work.

strynboen · « **Reply #82 on:** July 04, 2010, 03:14:58 AM »

the 500 are mutch bigger,,have just kleanet my 400 and 550 carbs..there are big differens,,jets are alså different push in and skreving type...
skreving

???dont now the right word $:-\$

Pezz · « **Reply #83 on:** July 04, 2010, 05:52:10 PM »

Quote from: strynboen on July 04, 2010, 03:14:58 AM

the 500 are mutch bigger,,have just kleanet my 400 and 550 carbs..there are big differens,,jets are alså different push in and skreving type...
skreving ???dont now the right word $:-\$

Skreving = screw in

Thanks for that info, May have to go to a wrecker wnd see whats close in size??

Pezz · « **Reply #84 on:** August 15, 2010, 10:54:49 PM »

Quote from: Rat400F on July 03, 2010, 06:43:06 PM

I'm out of town, when I get home I'll post a link. I'm not sure if the 500/4 carbs would work.

Rat400F

Have you found the link for the Jets ??

I need to get some real soon.

I will PM you about the 80's you didnt use

Industrial Rat400f Killer · « **Reply #85 on:** August 16, 2010, 06:27:09 AM »

Oh, I forgot I mentioned having those. If you don't want the whole kit that I linked in the pm I just sent let me know, I'll send you my 80's.
Greg

Pezz · « **Reply #86 on:** August 17, 2010, 11:12:00 PM »

Thanks Greg

Just ordered a set!!!

What exhaust and mods have you done to you motor?

I will have the 460 kit and a short open muffler on the stock headers

Industrial Rat400f Killer · « **Reply #87 on:** August 18, 2010, 06:15:29 AM »

The engine I'm running right now is stock with pods and I had a SS exhaust made but the builder didn't make it right so I'm having it fixed. I have been running a stock exhaust with a HD sportster muffler. I have a spare engine taken apart down to the crank that I'm going to build.

Pezz · « **Reply #88 on:** August 25, 2010, 07:16:05 PM »

Question:

What revs does the 400/4 pull at 60mph or 100kph in top?

I need to play with the gearing on this bike as it looks way too tall.

I want to keep the 17 tooth on the front as it gives the swingarm clearance.

Open to Suggestions ?

Tim2005 · « **Reply #89 on:** August 27, 2010, 09:50:10 AM »

Hi Pezz, 60mph is 5500rpm on my stock-geared bike... just checked today

Pezz · « **Reply #90 on:** August 29, 2010, 04:09:22 PM »

Quote from: Tim2005 on August 27, 2010, 09:50:10 AM

Hi Pezz, 60mph is 5500rpm on my stock-geared bike... just checked today

Thank you!!! Appreciate your help.

Just need to get a percentage reduction that would be a good place to start - 15%

6250 rpm @ 60??

Pezz · « **Reply #91 on:** November 20, 2010, 03:52:01 PM »

Well I need to get busy on this and get it finished. I have the bike almost back together again after fixing the rotor.

I need to find a larger rear sprocket, think i will get a universal one and drill it to suit.

I have to get the Oil cooler sorted. and where to mount it? Maybe above the front guard, and under the headlight??

I will be making some offroad footpegs for it from some old KTM ones I have in a box in the shed.

So much to do . . .

Pezz · « **Reply #92 on:** January 11, 2011, 12:58:34 AM »

Well as It is now running well and I should have it registered next week. A couple of things to look at.

I am going to take to an old bike wrecker who has a number of old tanks and seats to see if I can get better cacapity. I have removed the fork springs and measured them, now looking for some heavier springs.

The rear sprocket options has caused me some concern.

Standard final reduction of 2.235:1

I am running a 17 tooth front sprocket for clearance on the swingarm so road gearing would be 38 tooth. I was wanting to go to 42 tooth but found something close that was 41 tooth. This will give me a final drive ratio of 2.412:1. Hoping that is low enough. I now have to get the holes milled in, offest 45 Degrees to get the same spacing as the 400 rear wheel.

41 tooth on the left, 34 on the right was fitted to the bike.

Pezz · « **Reply #93 on:** January 13, 2011, 06:48:35 PM »

The Clutch on this bike is quite heavy?

Is this usual, or is there an adjustment I can make to lighten the lever pull?

Industrial Rat400f Killer · « **Reply #94 on:** January 13, 2011, 06:59:25 PM »

New cable maybe?

Pezz · « **Reply #95 on:** January 16, 2011, 02:49:14 PM »

Quote from: Industrial Rat400f Killer on January 13, 2011, 06:59:25 PM

New cable maybe?

I will pull it of and lubricate it and see if that makes any difference.

Rear sprocket has been milled and now fits. Chain has to have 4 links put back in.

I have also removed the XR forks for new seals. One came apart easy, the other is being a bit more difficult.

Draining the old fork oil, it looked like black filthy watery oil. Dont know if it was capable of doing much

It will have its first shake down ride this weekend.

Pezz · « **Reply #96 on:** January 23, 2011, 03:05:11 PM »

Well had the first ride last Friday, all went well, it ran for about 5 minutes then stopped.

I parked it in the shed, the next morning went out and it started right up a ran nicely. Again ran for 5 minutes then stopped.

To me it sounds like condensors. So I have sent an email to Z1 Enterprises and getting a price on a Dyna S and new coils.

First impressions / areas for improvement:

Fork springs are way to soft, foot pegs too high and bars too low.

I will fit a new tank and seat set up too. Very limited turning as tripples hit the tank.

Apart from that its great and it will be a blast on the open road

I will post a few pics when I upload them.

Pezz

Syscrush · « **Reply #97 on:** January 23, 2011, 06:38:23 PM »

Quote from: Pezz on January 23, 2011, 03:05:11 PM

Apart from that its great and it will be a blast on the open road

Very exciting - looking forward to some updates on this cool little machine!

Pezz · « **Reply #98 on:** January 23, 2011, 07:13:07 PM »

A Pic of it in its current trim, this will change with a new tank and seat setup

Pezz · « **Reply #99 on:** January 23, 2011, 10:19:06 PM »

In its intended environment - Taken by Tom Foster - Trail Bike Adventure Magazine

Obvious the fork springs are too soft

Couple of young blokes asking what the hell is that

News:

Author Topic: CB400 Four to XR400 Four (Read 51089 times)